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<meta charset="UTF-8">
<title>CSS3 水墨风格背景动画按钮DEMO演示</title>

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</head>
<body>

<svg width="0" height="0"> 
	<filter id="filter">
		<feTurbulence type="fractalNoise" baseFrequency=".01" numOctaves="6" />
		<feDisplacementMap in="SourceGraphic" scale="100" />
	</filter>
</svg>

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  <div class="button _1"> <span>hover</span>
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  <div class="button _2"> <span>hover</span>
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  <div class="button _3"> <span>hover</span>
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  <div class="button _4"> <span>hover</span>
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